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31 Years NEET Previous Year Questions: Transport in Plants - 2


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25 Questions MCQ Test Biology Class 11 | 31 Years NEET Previous Year Questions: Transport in Plants - 2

31 Years NEET Previous Year Questions: Transport in Plants - 2 for NEET 2023 is part of Biology Class 11 preparation. The 31 Years NEET Previous Year Questions: Transport in Plants - 2 questions and answers have been prepared according to the NEET exam syllabus.The 31 Years NEET Previous Year Questions: Transport in Plants - 2 MCQs are made for NEET 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Years NEET Previous Year Questions: Transport in Plants - 2 below.
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31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 1

Plants die from prolonged water-logging because [1997]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 1

Under water logged conditions roots die due to lack of air for respiration.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 2

The core metal of chlorophyll is [1997]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 2

A non ionic Mg atom is held in the centre of porphyrin (of chlorophyll) held by N atom of pyrrole ring.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 3

Bidirectional translocation of minerals takes place in [1997]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 3

Minerals can move upward and downward (bidirectional movement) as well as laterally in phloem. Phloem plays an important role in translocation of minerals.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 4

With increase in the turgidity of a cell surrounded by water the wall pressure will [1997]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 4

Wall pressure is equal and opposite to the turgor pressure.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 5

The movement of mineral ions into plant root cells as a result of diffusion is called

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 5

Osmosis is the movement of solvent particles  from a region of low solute concentration to a region of high solute concentration through a selectively  permeable membrane. Active  absorption involves  use of ATP.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 6

The closure of lid of pitcher in a pitcher plant, is due to [1995]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 6

Pitcher plant is an insectivorous plant which catches insects. The paratonic movements are induced in response to an external stimulus caused by insects due to which lids close and the insects are trapped inside the pitcher.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 7

Active and passive transports across cell membrane differ in [1993]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 7

 Active transport always involves the expenditure of energy for the movements of substances against concentration gradient.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 8

An adaptation for better gaseous exchange in plant leaves is [1993]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 8

Stomata present on lower surface of plant leaves effectively exchange gases without allowing much loss of water from the leaves.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 9

Which is produced during water stress that brings stomatal closure [1993]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 9

During scarcity of water in the soil, stress hormone abscisic acid is produced which brings about stomatal closure. ABA inhibits the uptake of K+ by the guard cells and promotes leakage of malic acid from guard cell. This result in loss of water from guard cell due to its lower osmotic potential. Guard cell become flaccid leading to closure of stomatal aperture. ABA also causes stomatal closure under high concentration of CO2 in the guard cells.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 10

Amino acids are mostly synthesised from [1992]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 10

a-ketoglutaric acid are the precursors of amino acid.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 11

In guard cells when sugar is converted into starch, the stomatal pore [1992]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 11

When sugar is converted into starch, the osmotic concentration of guard cells fall and they lose water to adjacent cells and stomata closes.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 12

At constant temperature, the rate of transpiration will be higher at [1992]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 12

The rate of transpiration is inversely proportional to the atmospheric pressure. Increased height above the sea level lower the atmospheric pressure and increases the rate of evaporation.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 13

Conversion of starch to organic acids is required for [1992]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 13

Starch is converted to malic acid (organic acid) through the action of an enzyme phosphoenol pyruvate carboxylase (PEPC) under condition of high pH when most of the CO2 is utilized due to high photosynthetic rate during daytime.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 14

In terrestrial habitats, temperature and rainfall conditions are influenced by [1992]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 14

Transpiration is responsible for saturation of the atmosphere.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 15

Guttation is mainly due to [1992]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 15

Loss of water from margins of leaves is called guttation. Guttation occurs when transpiration rate is very low as compared to rate of water absorption. Due to which root pressure is developed and water is pushed out through stomata like pores called hydathodes. It occur in more saturated atomosphere.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 16

Which of the following is used to determine the rate of transpiration in plants? [1992]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 16

Potometer is an apparatus used for measuring the rate of transpiration.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 17

Water movement between cells is due to [1992]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 17

Water is absorbed by a system having higher DPD from another system with lower DPD. The net force with which water is drawn into a cell is equal to the difference of osmotic pressure (OP) and turgor pressure known as diffusion pressure deficit (DPD).
DPD = OP – TP

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 18

The most widely accepted theory for ascent of sap in trees is [1991]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 18

Transpiration pull and cohesion theory was put forward by Dixon and Jolly in 1894. According to this theory water rises due to the transpiration pull, continuity of water column and the cohesive power of water molecules from the lower part of the roots  to the higher peaks of the trees.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 19

In soil, the water available for root absorption is [1991, 99]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 19

After rain a portion of water percolates downwardly under the influence of gravity. It is not available to plants. Hygroscopic water is also not available for plants because soil particles hold water by strong attractive forces. Chemically bound water is combined with chemicals. Capillary water is present in narrow spaces of soil and is held in soil by capillary forces and is absorbed by root.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 20

The principal pathway of water translocation in angiosperms is [1990]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 20

Water movement occurs through the trachaery elements of xylem.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 21

A bottle filled with previously moistened Mustard seeds and water was screw capped tightly and kept in a corner. It blew up suddenly after about half an hour. The phenomenon involved is [1990]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 21

The absorption of water by the solid particles of an adsorbent causing it to increase in volume without forming a solution is called imbibition. 

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 22

Stomata open and close due to [1988, 2002]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 22

Turgor pressure is the pressure that develops in a cell due to osmotic diffusion of water  inside  it and is responsible for pushing the membrane against cell wall. Stomata open under conditions of increased turgor pressure of guard cell and stomata get closed under conditions of decreased turgor pressure of guard cells. When turgid, they swell and bend outward. As a result, the stomatal aperture opens. When they are flaccid, the tension from the wall is released and stomatal aperture closes.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 23

Water potential is equal to [1988]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 23

Water potential is defined as the difference between chemical potential of water at any point in a system and that of pure water under standard conditions. The unit of measurement of water potential is pascal, Pa (1 mega pascal, Mpa = 10 bars). It is represented by greek letter PSi (ψ). Water potential has two components solute potential which is always negative and pressure potential which is usually positive. Therefore water potential ψw is expressed as: ψw = ψs + ψp

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 24

Transpiration is least in [1988]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 24

Transpiration is a process of loss of water in the form of vapours from the aerial parts of the plants. Transpiration is inversely proportional to the atmospheric humidity. The rate of transpiration would be higher when humidity is low.

31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 25

Phenyl mercuric acetate (PMA) results in [1988]

Detailed Solution for 31 Years NEET Previous Year Questions: Transport in Plants - 2 - Question 25

Phenyl Mercuric Acetate (PMA) is an antitranspirant. Antitranspirants are compounds applied to the leaves of plants to reduce transpiration without affecting gaseous exchange. They are used on Christmas trees, cut flowers, newly transplanted shrubs, and in other applications to preserve and protect plants from drying out too quickly. They have ‘also been reportedly used to protect leaves from salt burn and fungal diseases.
Anti Transpirants are of two types: 1. Metabolic inhibitors 2. Film forming antitranspirants

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